grammar <grammarName>;
s @after {<ToStringTree("$ctx"):writeln()>} : e EOF ; // must indicate EOF can follow or 'a\<EOF>' won't match
e : e '*' e
  | e '+' e
  |\<assoc=right> e '?' e ':' e
  |\<assoc=right> e '=' e
  | ID
  ;
ID : 'a'..'z'+ ;
WS : (' '|'\n') -> skip ;
